The preparation and reactions of bis(pyrazolyl)phenylmethane complexes of rhodium(I)
| Autor: | Ping Y. Leung, Louis K. Peterson |
|---|---|
| Rok vydání: | 1981 |
| Předmět: |
Olefin fiber
Denticity Chemistry Organic Chemistry chemistry.chemical_element Homogeneous catalysis Biochemistry Medicinal chemistry Rhodium Inorganic Chemistry chemistry.chemical_compound Materials Chemistry Organic chemistry Chelation Methanol Physical and Theoretical Chemistry Cyclooctadiene Carbon monoxide |
| Zdroj: | Journal of Organometallic Chemistry. 219:409-420 |
| ISSN: | 0022-328X |
| DOI: | 10.1016/s0022-328x(00)90026-3 |
| Popis: | The complexes [(LL)Rh(C 2 H 4 )Cl] x (I), [(LL)(Rh(cod)Cl) 2 ] (II), [(MeLL)Rh(C 2 H 4 ) 2 Cl] (III) and [(MeLL)Rh(cod)] + Cl − (IV) have been prepared via the reactions of the bis-(pyrazolyl)phenylmethane ligands PhCH(H 2 pz) 2 (LL; H 2 pz = pyrazolyl) and PhCH(Me 2 pz) 2 (MeLL; Me 2 pz = 3,5-dimethylpyrazolyl) with [Rh(C 2 H 4 ) 2 Cl] 2 and [Rh(cod)Cl] 2 (cod = cyclooctadiene). Complex IV reacts with NaBPh 4 to form [(MeLL)Rh(cod)] + BPh 4 − (V). III and IV reacts with carbon monoxide to give [(MeLL)Rh(CO) 2 ] + [Rh(CO) 2 Cl 2 ] − (VI). Complexes I and III give neutral solutions in methanol, while II and IV behave as 1 : 2 and 1 : 1 electrolytes, respectively. The rhodium(I) centre is typically four-coordinate in I, II, IV–VI, and five-coordinate in III. The ligands LL and MeLL show bidentate chelating behaviour in all of the above complexes, with the exception of II, where LL bridges two different Rh I moieties. Reactions with H 2 , HCl and Ph 3 P are described. Complex III functions as a homogeneous catalyst, in neutral methanolic solution, for the hydrogenation of olefin, but is ineffective for the hydrogenation of α β-unsaturated aldehydes and ketones. |
| Databáze: | OpenAIRE |
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